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Electronic Theatre Controls Inc

How do you keep the lights ON during the day and use occupancy sensors after hours?


A common application for commercial office areas is to have lights on during day time hours and revert to occupancy control after hours.


This application requires time-of-day scheduling so a time clock is needed and the wireless controllers should be configured for Occupancy Control with the sensors. Additionally, the project will need an Echoflex Active Circuit Transmitter. This transmitter is available as a 24V or 120V device ( ERM-DAU-LV, 8188A1123-X-1 or ERM-DAU, 8188A1119-X-1 respectively). The 24V model is often more convenient as it is easier for a contractor to run low-voltage wire out into the controlled space, especially in states where LV wiring does not require conduit. When powered, the ACT sends occupancy state messages and appears like a normal wireless occupancy sensor to Echoflex controllers. As long as the ACT has power, the lights will stay on. If the project is a retrofit and has an existing time clock / panel, it can be used for the time-of-day schedule.

  1. Wire the power for the Active Circuit Transmitter (ACT) through a relay operated by the time clock. If using a third party panel, assure the relay is rated for the voltage. If using the Elaho Time Clock (E-ATC, 8186A1000) either stand-alone or in a  Elaho Room Controller, it's often easier to wire an Elaho 24V Auxiliary Power Supply (E-APS, 8186A1213) through the relay (in the room controller) with the power supply output connected to the ACT. This will power the ACT only when the time clock schedule is active.
  2. The ACT must be linked to the controllers operating the lights in the desired space. The ACT has a TEACH button, just like Echoflex sensors, and the same procedure for linking sensors is used
  3. Set the schedule in the time clock for the period you wish the lights to remain ON
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